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[norman shen <1880455@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

After
https://github.com/openstack/neutron/commit/efa8dd08957b5b6b1a05f0ed412ff00462a9f216
this patch, I saw unexpected vlan interruption after live migration.

The steps to reproduce the problem is simple,

first create two vm01, vm02 on compute01 and compute02 separately, then live migrate vm02 to compute01, after it completes live migrate vm02 to compute02. After this you saw vm01 cannot access vm02. And ovs-appctl dpif/dump-flows br-int saw flow from vm01 to vm02 are dropped.
 
I am now suspecting the following code are never executed

https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L685

because for nova port are removed before delete port get called.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1880455

Title:
  interrupted vlan connection after live migration

Status in neutron:
  New

Bug description:
  After
  https://github.com/openstack/neutron/commit/efa8dd08957b5b6b1a05f0ed412ff00462a9f216
  this patch, I saw unexpected vlan interruption after live migration.

  The steps to reproduce the problem is simple,

  first create two vm01, vm02 on compute01 and compute02 separately, then live migrate vm02 to compute01, after it completes live migrate vm02 to compute02. After this you saw vm01 cannot access vm02. And ovs-appctl dpif/dump-flows br-int saw flow from vm01 to vm02 are dropped.
   
  I am now suspecting the following code are never executed

  https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L685

  because for nova port are removed before delete port get called.

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